package com.atguigu.flink.chapter07.state;

import com.atguigu.flink.bean.WaterSensor;
import org.apache.flink.api.common.state.ValueState;
import org.apache.flink.api.common.state.ValueStateDescriptor;
import org.apache.flink.configuration.Configuration;
import org.apache.flink.streaming.api.environment.StreamExecutionEnvironment;
import org.apache.flink.streaming.api.functions.KeyedProcessFunction;
import org.apache.flink.util.Collector;

public class Flink04_State_Keyed_Value {
    public static void main(String[] args) throws Exception {
        StreamExecutionEnvironment env = StreamExecutionEnvironment
                .getExecutionEnvironment()
                .setParallelism(3);
        env
                .socketTextStream("hadoop162",9999)
                .map(value -> {
                    String[] datas = value.split(",");
                    return new WaterSensor(datas[0], Long.valueOf(datas[1]), Integer.valueOf(datas[2]));

                })
                .keyBy(WaterSensor::getId)
                .process(new KeyedProcessFunction<String, WaterSensor, String>() {

                    private ValueState<Integer> lastVcState;

                    @Override
                    public void open(Configuration parameters) throws Exception {
                        lastVcState = getRuntimeContext()
                                .getState(new ValueStateDescriptor<Integer>("lastVcState", Integer.class));
                    }

                    @Override
                    public void processElement(WaterSensor value, Context ctx, Collector<String> out) throws Exception {
                        Integer lastVc = lastVcState.value();
                        if (lastVc != null) {
                            if (value.getVc() > 10 && lastVc > 10) {
                                out.collect(ctx.getCurrentKey() + "连续两次水位超过10， 红色预警...");
                            }
                        }
                        lastVcState.update(value.getVc());
                    }
                })
                .print();

        env.execute();

    }
}
